txmorse Morse code transmitter

This application is an example which transmits Morse code messages using the Morsey library.

You can run txmorse -h to display help information.

Supported Devices

Note

This application does not currently support all possible Morse code transmission devices available on NuttX NuttX. Currently, only GPIO devices are supported.

In order to add support for a new output device, you must submit a patch modifying the program to define the interface for the Morsey library for each type of output device. Take a look at the current application code to see examples for console devices and GPIO devices.

The txfunc function is used by the morsey library to transmit a mark. You can implement the appropriate driver operations (i.e. ioctl calls) in this function. See the GPIO implementation for an example.

The cleanupfunc function is used to cleanup the implementation. For most NuttX devices, this involves closing the file descriptor.

In the main function, the path to the output device is used to identify the implementation to use. For instance, GPIO devices are under /dev/gpio<n>, so device paths containing “gpio” cause the GPIO driver to be selected. If no player can be associated with the device, the default player is selected which just prints the Morse code to the console.

Usage

The following will output “SOS” over a GPIO device (i.e. buzzer or LED):

nsh> txmorse "sos" /dev/gpio0